Re: Difference between current biotic/ abiotic theories and
Suresh,
If I understand you right, You think that thermal generation of oil and gas from organic ("fossil") material is not the main process, but that substantial, if not all oil is abiotic?
You are probably aware of the theory of Professor Gold, astrophycisist, who defended this theory, originally put forward by russian geologists.
Typically, the abiotic theory is suggested and defended by people who are quite ignorant of petroleum geology or especially geochemistry. My research, and that of others has shown that there is a very significant correlation between amounts of oil found and the amounts that were generated thermally from identified source rocks. The latter normally are effective when organic carbon content reaches 1.5% or more. Also the fingerprinting by a multitude of geochemical compounds, and isotope analysis tells us that the thermal generation from organic remains is paramount.
Please note that remarkably little oil has been found in basement areas which are drilled nevertheless for minerals. However, somewhat confusing, oil can migrate into wheathered basement, like arkose, thereby suggesting the oil was generated from igneous rocks.
A significant example where the source can be identified easy is the "ichtyol" oil, with fish scales in it, and the fossil fish shales that form the corresponding sourcerock.
I recommend reading:
M.H.Nederlof (1979) "The use of habitat of oil models in exploration prospect appraisal", Proc. 10th World Petroleum Congress, Bucharest 1979, Vol 2, p.13-21
D.Sluyk & M.H.Nederlof (1984) "Worldwide geological experience as a Systematic basis for Prospect Appraisal", AAPG Memoir 35, p.15-26.
M.H.Nederlof (1988) "The Scope for Natural Gas Supplies from Unconventional Sources", Annual Review of Energy, 1988, Vol. 13, p.95-117.
Also the part on the Gaeapas program in
http://www.mhnederlof.nl